Effects of Irrigation and Application of Phosphorus Fertilizer on the Yield and Water Use of Tomato Grown on a Clay Terrace Soil of Bangladesh

A field experiment was conducted in the rabi (dry) season of 1998一一99 on a clay terrace soil of Bangladesh to study the effects of irrigation and P fertilization on the yield， total water use， and water use efficiency of tomato． Five levels of irrigation and four ｝evels of P application were inv◎玉ved．至rrigati◎n， P apP圭icati◎ll， aftd抜e賊eracもio鍛◎f irr玉gaも沁難and P ap擁caζi◎簸had a s三9茎嚢貸ea蕪も㎞茎｝acも。難論蓬e yie三d ofも。熱aも｛)． IRも鼓e韮盈div董d経a圭e￡艶。宅s(＞f三rrigaも圭oR a轟く蓬Pa茎》峯)｝ica一 も主0勲諏ey圭e蓋d was sigr藪caRも圭y㎏切回捻e康ree a難dゴb慧r l懸gaも沁RS・a：d・at・the・P・｝evel◎罫12e kg P205 ha一関． As the i莇eractlo薮effect，￡he h三ghest y圭e圭(豊◎f 38．7】糠g熱a 甕w三門the max㎞um neも benefit was obtained under the corabination of three irrigatlons at i 5， 35， and 55 days after transplantation of seedlings and P application at the level of 120kg P20s haAi． lts total water use was 169 rnrn， giving the reasonably high water use efficiency of 229kg ha＝t inm-i． The highest range of water use efficiency was noted in non-irrigation treatments， but the yield and net benefit were about half of those of the highest yield． The treatment with three irrigations along with P application at the level of 120 kg P20s ha-i was concluded to be the best combination for the sustainable tomato cultivation in Shallow Red-Brown Terrace Soil of Bangladesh．